Vibrating screen



March 19, 1929. M, A, KENDALL 1,705,619

VIBRATING SCREEN Filed June 19, 1925 Patented Mar; 19, 19290 MYRON A.KENDALL, OF AURORA, ILLINOIS, ASSIGNOR TO STEPHENS-ADA118011 MFG.

PATENT OFFICE.

60., OF AURORA, ILLINOIS, A CORPORATION OF ILLINOIS.

vrsrmrrne soannn.

Application filed June 19, 1925. Serial No. 38,149.

This invention relates to screens, and more particularly to vibratingscreens and means for operating the same.

One of the objects of the invention is the provision of new and improvedmeans for resiliently mounting the screen and for angularly adjustingthe same.

Another object of the invention is the provision of new and improvedmeans and arrangement of parts for vibrating the screen.

A still further object of the invention is the provision of new andimproved means for mounting the screen element in the screen frametogether with new and improved means for properly tensioning the same.

Another object of the invention is the provision of a new and improvedvibrating screen that is cheap to manufacture, easily assembled,elficient in operation, simple in construction, and one that is notlikely to become broken or get out of order.

Other and further objects and advantages of the invention will appearfrom the following description taken. in connection with theaccompanying drawings, in which Fig. 1 is a side elevation of the devicewith parts in section and parts broken away;

Fig. 2 is a section on the broken line 2-2 of Fig. 1, with parts brokenaway and parts removed; I

Fig. 3 is a section on line of Fig. 2;

Fig. 4 is a transverse section of a modified form of screen frame;

Fig. 5 is a perspective view of one of the unbalanced discs; and

Fig. 6 is a fragmentary view of a screen showing a still further.modified form of stretching means.

On the drawing the reference character 10 designates a suitablesupporting frame which, for convenience of illustration, is shown ascomprising the upright posts 11 to which are secured the side bars 12and.

' end bars 13 for forming a rectangular memher on which the screen ltand operating mechanism 15 are'adapted to be mounted.

Suitable resilient means 'are provided for mounting the screen 14 on theside bars 12. It has been found by experiment that best results areobtained b employing leaf springs and arranging t e same longitudinallyof the screen frame. As shown, a semi elliptic spring 16 is mounted onthe side bar 12, at each side of the frame, as by-means of the perches17 and shackles 18. A support 19 is rigidly connected to each spring 16and extends upwardly therefrom. A base plate or bar 21 isrigidlyconnected to the upper ends of the supports 19 for supportlng theoperating mechanism 15.

Suitable means are provided for adjustably connecting the screen 14' tothe supports 19. In the form of the device selected to illustrate oneembodiment of the invention the screen 14: is pivotally connected as at22 to the supports 19. Preferably the pivot is located in the centraltransverse plane of the same. Curved slots 23 and 24 may be provided inthe supports 19 which are adapted to be engaged by clamping bolts 25carried by the screen for holding the same in angularly adjustedposition.

In devices of this nature, it is the common practice to provideunbalanced rotating weights for vibrating the screen and to provide amotor or other mechanism independently of the weights for operating thesame.

In the present device the motor is mounted above and vibrates withthescreen. This arrangement is considered an important feature of theinvention. It greatly simplifies and cheapens the construction of thedevice. Since the screen frame may be r1gidly connected to the supports19 in its adjusted position, the motor which is mounted on the supportsma be considered as being mounted on or rigi ly connected to the screenframe,

The operating mechanism 15 comprises a motor 26 having its armatureshaft extended to each side thereof, on which are mounted unbalancedweights as the discs 27. These discs may be rendered unbalanced in theusual or any well-known manner. In the form shown they are concentricwith the" shaft and portions of one side thereof are removed as bydrilling holes 28 therein. .These ing corresponding plugs for varyingtheir vibratory effect during rotatlon. The motor is rigidlyconnected'to the base plate 21 and is preferably arranged above thecentral holes maybe internally threaded for receivportion of the screen.For obtaining the est results the armature shaft is arrangedlongitudinally of the screen although it is understood it may beotherwise. It may, if desired be provided with a casing 29 forprl'iotecting the same from dust, dirt and the li e.

The screen comprises a rectangular screen frame formed by the side bars31 and the end bars 32 rigidly connected together. A. side plate 33 isprovided at each side of the screen for preventing the material fromspilling or-escaping over the side edges of necting bars between theclamping plates 35 are employed.

In vibrating screens it is desirable that means he provided forpreventing the sagging of the screen element during the operation of themachine. One form of means for stretching the same is disclosed in Fig.2 and will now be described.

The side bars 31 of the screen frame are preferably in the form of anglebarsfwith the horizontal flanges extended inwardly to form supports forthe clamping plates 35. An angle bar 36 is attached to each side plate33 to form an anchor for the stretching bar 37 The upper end of thestretching bar 37 is adapted to engage the flange of the angle bar 36and its lower end is adapted to engage the upper clamping plate 35. Thebolt 38 extending through the stretching bar and the side plate 33 isadapted to place the necessary tension on the wire mesh to cause it tooperate to the best advantage.

In Fig. 4 is shown a modified form of mechanism for stretching thescreen element. In this form of the device an angle bar 39 is rigidlyconnected to the side plate 33 adjacent to the side bar 31 and has itsflange extending parallel with the horizontal flange of said bar. Thestretching bar 41 is in the form of an angle with one flange slidablyengaging beneath the flange of the angle bar 39 and the other engagingthe upper of the clamping plates 35. The proper tension is placed on theelement 34 by means of a bolt and nut' 42 which engage the stretchingbar 41 and the side plate 33 as clearly shown in Fig. 4 of the drawings.

In Fig. 6 is shown a still further modified form of stretching means. Inthis form of the device a J-bolt 45 which-extends through the side plate33 and engages the upper clamping plate 46, is employed for tensioningthe screen 34. The angle bar 39 is moved down from the position shown inFig. 4 so that it will engage the upper surface of the bolt 45 toprevent its upward movement, whereby the bolt will hold the clampingplates 46 and 47 downward against the flange of the angle bar 39. Ifdesired, the clamping plate 46 may be provided on its inner edge withanundercut surface which is adapted to be engaged by the inner end of theJ-bolt. only necessary to adjust the nut 48 on the bolt 45. e

In the operation of the device the screen may be adjusted to the properangle by loosening the nuts on the bolts 25. The required tension may be'placed on the screen element by the bolts 38 or 42. If desired one ormore plugs may be inserted in the holes 28 for changing the relativevibration of the discs 27. i

It is thought from the foregoing taken in connection with theaccompanying drawings that the construction and operation of my devicewill be apparent to those skilled in the art, and that various changesin size, shape, proportion and details of construction may be madewithout departing from the spirit and scope offthe appended claims.

I claim as my invention:

1. In combination, a screen frame, a' screen element secured across saidframe, a support, means forang ularly adjustably mounting said frame onsaid support, a motor fixedly mounted on said support, and an unbalancedweight secured to the shaft of said motor for vibrating said frame.

2. In combination, a screen frame, a support for said frame, a screenelement secured across the lower portion of said frame, means forangularly adjusting said screen frame on its support, an electric motorhaving an unbalanced weight on the armature shaft, and means formounting said motor on said frame with the armature shaft extendingparallel with the longitudinal axis 0; the frame and in the o 3. Incombination, a screen frame, a supporting member for said frame,resilient means for supporting said member, means for pivotally mountingsaid frame on said supporting member to permit the same to rotate aboutits transverse axis independently'of said resilient means, means forsecuring said frame in adjusted position about said transverse axis, andmeans-fixedly mounted To tension the screen 34 it is verticalplanethere- I on said support for vibrating said frame and support.

4. In a screen device, a support, a screen frame, a supporting frame,means for angular-1y adjusting said screen frame relative to saidsupporting frame, a leaf spring at each side of said supporting framefor supporting the said screen frame therefrom, said springs beingarranged longitudinally of said screen frame, means mounted on saidsupporting frame for vibratingsaid screen frame, and means for angularlyadjusting said screen frame relative to said springs.

5. In combination, a frame, a support, resilient. means for mountingsaid support on said frame, a motor fixedly mounted on said support, ascreen adjustably mounted on said support between said motor and saidresilient means, said motor being ro-' port and extending longitudinallythereof,

a support mounted on said springs, a screen frame mounted on saidsupport and angularly adjustable about. its transverse axis, a motorrigidly mounted on said support and having its armature shaft extendinglongitudinally of said screen frame, an unbalanced weight on said shaft,and a screen element in said screen frame.

7 In a vibrating-screen mechanism, a supporting frame, a screen, amotor, means for angularly adjusting said screen on said frameindependent of said motor, means for rigidly connecting said motor tosaid screen, and an unbalanced weightpn the armature shaft of saidmotor.

8.' In a vibrating screen} mechanism, a screen frame, a screen in saidframe, means for flexibly supporting said screen frame in an inclinedposition, means for angularly adjusting said screen frame relative tosaid first-named means, a power shaft associated with said screen frameand extending in the direction of the inclined axis of said screen, andunbalanced weights on said-shaft for vibrating said screen when saidshaft is rotated.

9. In a vibrating screen mechanism, a

screen frame comprlsing side and end walls,

a pair of angle bars attached to each side wall and having flangesextending inwardly of said frame, a screen, clamping plates secured toeach side edge of said screen, said plates being slidably mounted on thelowermost of said flanges, and means including stretchin bars havingtheir upper ends engaging eneath the uppermost of said flanges andhaving their lower ends engaging said clamping plates for stretchingsaid screen.

In testimony whereof I aflix my signature;

MYRON KENDALL.

